Reporting performance problems
This article is dedicated to reporting performance problems with IntelliJ IDEs and related information to JetBrains support. You can submit a support request via Help menu in your IDE or via Submit a Request button at the top of this page.
IntelliJ IDEA and PyCharm Community Editions do not bundle Performance Testing plug-in that is required for profiling. Please install it: In Settings (Preferences) | Plugins search for Performance Testing on Marketplace tab.
IDE hangs and doesn't respond
When IDE hangs and doesn't respond so that you can't use the menu to capture the CPU snapshot, provide the thread dumps.
The CPU usage is high or IDE is slow
If you can continue working with the IDE, but it feels slower than expected or CPU usage is high:
-
Capture CPU Snapshot
Details
To provide an informative CPU snapshot you should click on Help | Diagnostic Tools | Start CPU Usage Profiling. For the first time you may be prompted to restart IDE (necessary VM options will be added) - in this case, after restarting select Start CPU Usage Profiling again.
Then perform the actions which are causing performance problems, try to reproduce the performance problem several times while the snapshot is being recorded, then click on the Help | Diagnostic Tools | Stop CPU Usage Profiling to save the snapshot file (snapshot is saved in the user home directory and IDE will show a notification with the exact file name, the extension of the file is .zip). If you don't see a notification and can't find the snapshot file, please check that notifications are enabled for the Profiler.
When reporting the problem, please make sure to describe what you were doing in detail.
- Upload snapshot
Memory Leak or High Memory Consumption
If you can continue working with the IDE, but there is a memory leak:
-
Capture memory Snapshot
Details
If the problem you are reporting is related to the heavy memory usage and frequent garbage collection, while increasing the heap size doesn't help, use the Help | Diagnostic Tools | Capture Memory Snapshot menu item.
To capture automatic memory snapshots when IDE runs out of memory, add
-XX:+HeapDumpOnOutOfMemoryError
into .vmoptions file. .hprof dump file will be created in the current working directory of the application (IDEA_HOME/bin). In case this directory is read-only, add
-XX:HeapDumpPath=/dumps/folder
option to change it. See Oracle documentation for more details.
Please note, that memory snapshot may contain the sensitive source code from your project.
jmap Binary Memory Snapshot
Use jmap utility from the Java distribution to get shared object memory maps or heap memory details for a process. Process ID (pid) can be obtained using jps utility or your system specific process manager. Example:
jmap -dump:live,format=b,file=heap.bin <pid>
- Upload snapshot
Profiling Slow Startup
If IDE is starting up slow:
- For 2023.2+ IDE versions, install the YourKit Profiler for IDE Performance Testing plug-in from Settings | Plugins.
-
Capture CPU usage snapshot of slow startup
Details
Invoke Help | Diagnostic Tools | Profile Slow Startup. Press Change and Restart IDE. After the restart, invoke Help | Diagnostic Tools | Stop CPU Usage Profiling.
- Upload snapshot
Profiling Slow Indexing
If the indexing process of an exact project runs longer than expected:
-
Capture CPU snapshot of slow indexing
Details
If you are using 2023.2 or later version, please open Settings (Preferences) | Plugins, search for YourKit Profiler for IDE Performance Testing on Marketplace tab and install it firstly.
Invoke Help | Diagnostic Tools | Profile Indexing. Click Invalidate and Restart (please note that Local History and Indices will be destroyed). Click Open Snapshot in ... to locate the snapshot.
If indexing doesn't stop, invoke Help | Diagnostic Tools | Stop YourKit Profiler (or Stop CPU Usage Profiling in earlier version) after waiting on the indexing phase a bit.
- Upload snapshot
Profiling build process
Please refer to this web help page to get detailed instructions on how to profile a build.
Article is closed for comments.
This line no longer works on 64 bit linux:
* *-agentlib:yjpagent64=delay=10000
The line that works is
-agentlib:yjpagent-linux64=delay=10000
The new line is needed since at least idea-IU-117.798. The name of the library is now libyjpagent-linux64.so.
Michael Hirsch, thanks for the correction, I've updated the document.
I'm seeing hanging too, with pycharm maxing the CPU for about a minute when it happens, which seems to be when I open a contextual menu.
I am also seeing hanging in pycharm 3.4 when using the contextual menu. Should I submit some Snapshots?
Memory snapshot https://yadi.sk/d/V_vsnqi2eWPFU
I have 8.03 on Windows and cannot save my CPU Snapshot. After I click Stop CPU Usage Profiling there is no way to save the snapshot file.
Snapshots are now saved automatically and you should see a notification about that with a link to open the folder where it's stored:
Thanks Serge - I also needed to turn Profiler notifications on (they're disabled by default). I got it now though.
I tried to run CPU profiler in webstorm 10 EAP but there is no option for Start CPU Usage Profiling
How do you disable the profiler if it is on by defautl? I am having performance problem and want to try to turn this part off.
Remove this line from the .vmoptions file
-agentlib:...
@Serge I am running an EAP .. i figured it out by going into idea.sh and setting is_eap to false
I'm unable to edit idea64.exe.vmoptions on my Windows machine...seems there's some process that's using it and not allowing me to edit it. I've closed completely out of IntelliJ IDEA and still can't edit it.
Run your editor as Administrator, then open the file and edit it, otherwise UAC will not allow to edit files under Program Files folder for regular users.
I'm such a dummy...just got a coffee so that will hopefully help my brain work! It is annoying that I'm running as an Admin on my PC and yet I have to grant the User group permission to modify the file...all set now...thanks.
IntelliJ is very aggressive about toString()'ing things in the debugger, and when I disabled the cache on my database to try to slim-down our memory profile, boy did that get me in trouble. Specifically, I'm using MapDB which (as the name implies) has databases that interface as java.util.map objects. As such a
mapDBStoreObjectThatsInstanceOfMap.size()call, when the database isnt caching, will take a really long time.Any chance there's a @Debugger(ignoreField = true) annotation I could put on this field or something similar?
Better yet, If I could make a feature request, it would be that whatever code is evaluating the toString of these things in the environment, does so on another thread with liberal use of timeouts.
I have webstorm 10.0.2 the latest version of web storm. Some how my CSS auto complete does not work. I can't see the auto complete of my bootstrap css and my custom css. I just recognize only html and javascript. In webstorm version 8 is working perfectly fine. When I download the new version of webstorm, it won't work any more. What should I do?
Sam, please submit a ticket to support with idea.log (https://intellij-support.jetbrains.com/entries/23352446).
Hi Serge,
In: Library/Preferences/
I had no WebStorm folder so I created one and copied the webstorm.vmoptions file to that location.
Restarted webstorm.
I was supposed to get the tools "Start CPU Usage Profiling and Capture Memory Snapshot".
I only have "capture memory snapshot" which was present from the beginning.
Thanks / E
You are looking in a wrong folder, search for the existing one, it's under ~/Library/Preferences, not /Library/Preferences. ~ stands for /Users/<user name>, so the actual folder is under /Users/<user name>/Library/Preferences.
Is it possible to capture CPU Snapshot automatically? I am requested to do so but I am unable to save snapshot because IntelliJ will hang indefinitely once the issue happens.
Martin, in such cases you should provide a thread dump instead: https://intellij-support.jetbrains.com/entries/23348667 .
This IDE is the black sheep of the JetBrains family. I have a super-powerful computer and the Webstorm stumbles like a cow in a bucket.
The instructions to locate vmoptions file can be found here:
https://www.jetbrains.com/pycharm/help/tuning-pycharm.html
http://i.imgur.com/mPer0nQ.png
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Please submit a ticket to support with a memory snapshot.
Serge Baranov
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I believe OS X needs this line instead (for the YourKit I downloaded today):
-agentpath:libyjpagent.jnilib=delay=10000
But IntelliJ IDEA still doesn't have extra options in the Tools menu...
Luke, make sure you've added it to the correct .vmoptions file per https://intellij-support.jetbrains.com/entries/23395793 . Note the Mac OS X specifics (modify a copy of the original file). Check idea.log to ensure that profiler agent was loaded. YourKit agent is already present in the Ultimate Edition. If you are using Community Edition, you need to connect to IDE via profiler UI, there will be no buttons in the menu.